Restructuring - Additional Information (Detail) $ in Thousands	Dec. 31, 2015 USD ($)
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Expected restructuring charges	$ 11,000
Incurred from inception to December 31, 2015	94,659
AOR [Member]
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Expected restructuring charges	5,000
Incurred from inception to December 31, 2015	800
MPI [Member]
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Expected restructuring charges	6,000
Incurred from inception to December 31, 2015	41,714
MPI [Member] | Legal and other advisor fees [Member]
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Incurred from inception to December 31, 2015	$ 4,000